Removed redundant variables in index.ts

After moving displayName and userIcon from ConnectedUser to UserConfig,
an error in index.ts occurred. Removed this redundancy.

server/src/index.ts

@@ -62,11 +62,6 @@ io.on("connection", async (socket: any) => {
   const defaultConnectedUser: ConnectedUser = {
     uid: "UID",
     socketId: socket.id,
-    displayName: "DISPLAY NAME",
-    userIcon: {
-      foregroundImage: "FOREGROUND IMG",
-      backgroundImage: "BACKGROUND IMG",
-    },
     location: {
       lat: 9999,
       lon: 9999,
@@ -196,11 +191,6 @@ app.post("/users", async (req, res) => {
     const status = await createUser({
       uid: req.body.uid,
       socketId: req.body.socketId,
-      displayName: req.body.displayName,
-      userIcon: {
-        foregroundImage: req.body.userIcon.foregroundImage,
-        backgroundImage: req.body.userIcon.backgroundImage,
-      },
       location: {
         lat: Number(req.body.location.lat),
         lon: Number(req.body.location.lon),